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Issue 46, 2014
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Simple and extremely efficient blue emitters based on mononuclear Cu(I)-halide complexes with delayed fluorescence

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Abstract

Simple mononuclear Cu(I)-halide complexes, [CuX(PPh3)2(4-Mepy)] (X = Cl, Br, I; PPh3 = triphenylphosphine; 4-Mepy = 4-methylpyridine), were prepared. They exhibit blue light emission, with extremely high photoluminescence quantum yields approaching 100% in the crystals. Emission lifetime analyses and density functional theory calculations revealed that the bright blue light emission at room temperature is mainly delayed fluorescence originating from the singlet metal-to-ligand charge transfer (MLCT) state combined with the halide-to-ligand charge transfer (XLCT) state, (1(M + X)LCT), while that at 77 K is phosphorescence from the 3(M + X)LCT transition state, due to the small singlet–triplet energy differences (ΔE = 940–1170 cm−1). The ternary ligand systems consisting of halide, bulky phosphine, and N-heteroaromatic ligands constitute inexpensive pure-blue-light-emitting materials, which can be fabricated by facile procedures such as simple manual grinding.

Graphical abstract: Simple and extremely efficient blue emitters based on mononuclear Cu(i)-halide complexes with delayed fluorescence

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Publication details

The article was received on 04 Sep 2014, accepted on 25 Sep 2014 and first published on 26 Sep 2014


Article type: Paper
DOI: 10.1039/C4DT02709D
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Citation: Dalton Trans., 2014,43, 17317-17323
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    Simple and extremely efficient blue emitters based on mononuclear Cu(I)-halide complexes with delayed fluorescence

    H. Ohara, A. Kobayashi and M. Kato, Dalton Trans., 2014, 43, 17317
    DOI: 10.1039/C4DT02709D

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